Connecting-circuit for telephone-exchanges.



E. D. HALL CONNECTING GIROUIT FOR TELEPHONE EXCHANGES.

Patented July 11 1911 APPLICATION FILED DEG. 8, 1910.

UNIT D STATES PATENT, oFFIcE; I

EVERETT I). HALL, OF NEW YORK, N. Y., ASSIGNOR TO WESTERN ELECTRIC COMPANY, OF NEW YORK, N. Y., A CORPORATION OF ILLINOIS.

a CONNECTING-CIRCUIT FOR TELEPHONE-EXCHANGES.

Application filed December 8, 1910. Serial No. 596,371.

To all whom it my concem: -Be it known that I, EVERETT D. HALL,

" citizen of the United States. residing at 'New York, in the county of New York and State of New York, have invented a certain new and useful Improvement in Connecting- Circuits for Telephone-Exchanges, of which the following is a full, clear, concise, and exact des'cription.

This invention relates to telephone exchange, systems w herein different types of telephone lines tern'iin'ate upon the same sect-ion'of the bOtll(l,tIlI1(l therefore require connecting circuits ivhich automatically adapt Ehelnselves to the character of the lines they interconnect.

'lVhena magneto or through connection is set up, such conncctii'ig circuits usually are clear of all apparatus and a continuous conductive path is provided between the interconnected stations. However, the diverse nature of certain interconnected magneto through inductive apparatus for the transkey,

ference of voice currents, the ability of the connecting circuit thereafter to adapt itself to the next connection involving said inductive apparatus, and an associated battery, not being affected by the position of said manual means.

In accordance with this invention, the in-' clusion of the inductive means is independently controlled by a manual key and by antom atic electrom a gnetic mech anism, the latter operating invariably upon connection with a particular character of line, to introduce said inductive means with an associated battery into the talking circuit irrespective of the prior ,inanipulation of said manual More specifically, a manual key isassociatcd with the cord circuit adapted when actuated ,to conductively disconnect. the cord circuit and inductively unite the same through a repeating coil, and relays are provided in a strand of one of the plugs adapt ed to operate up 0n connection with the grounded sleeve of a common battery line to include said repeating coil and an associated battery in circuit, common battery supervisory signaling apparatus being-simultaneously substituted for the corresponding magneto signaling apparatus normally associated with the connecting circiiit.

Referring to the drawing, which is a diagram illustrating the invention, M represents a magneto substation, having the usual magneto generator 1, bell 2, telephonic apparatus 3, connected up in awell known manner and terminating at the central oflice ina springjack J with which is associated the usual line signal and night'alarni apparatus 4 adapted to be actuated by the op eration of the magneto generator 1 to at tract the attention of the operator.

C represents a common battery substation having telephonic apparatus and hell 6 also connected in a well known manner, tcrn'iinating at the central oflice in a springjack J similar to springjack J except that the sleeve .9 thereof is grounded while the sleeve 8 of jack J is left open. Line signal and night alarm apparatus 7 is associated with springjack J the connections whereof are readily apparei'it.

The connecting circuit is arranged normally for magneto connections and terminates in plugs 1, P, plug 1 being invariably associated with magneto lines, while plug P is adapted to connect with lines of either type and therefore has connected in its sleeve strand 8 the electromagnetic means which renders the cord circuit elastic. This electromagnetic means may comprise two relays 9, 10, relay 9 being connected with battery 11 and relay l0 with battery 12. the con ductors l3, 14; leading respectively from the other ends of their windii'igs, uniting at 15, and cont-inuingby conductor 16 to sleeve 8 of plug P, the circuit of these relays being completed by said sleeve to the grounded,

inoperative' position. When thrown,

on the latter introducing a disturbing or unbalancipg influence upon the metallic line. It is desirable in,such cases that the lines be conductively separated. In the drawings the key K is adapted to perform this function by separating the line conductively and uniting it inductively through the repeating coil R. This key is shown in its normal or it opens at contacts 38, 39 the normal through ing an appreciable throughconductive connections, due to its conductive path and continues the circuit instead by way of conductors 3%,35 .connected at 36, 37. with opposite sides of the left-hand windin associated with the plug P without. exercisshunting effect on 1 high self-induction and the fact that the circuit of the companion winding is open during such connect-ions. 1

It is apparent that not only is the operator freed from the necessity of selecting the proper connecting circuit, but is en abled thereafter, ather discretion, to conductively separate the same and inductivelyunite' the sections through'a repeating. coil,

the subsequent inclusion in the cord circuit of this same repeating coil, and in addition a talking battery, by the relays 9, 10 not being interfered with by the prior actuation or non-actuation of the key K;

It will be understood that while for convenience of description separate batteries are illustrated, they may be and in practice are one and the same.

I claim:

1. In a telephone exchange, the combination with a connecting circuit for uniting lines of different character, of inductive means, manual and electromagnetic means irulcpruulcntly governing the inclusion of said inductive means, said electromagnetic means operating invariably to control the inclusion of said inductive means when said connecting circuit is united with a predetermined character of line regardless of the condition of said manual means.

of repeating coil R, whose other windmg may be permanently 2. In a telephone exchange, the combination with a connecting circuit adapted for uniting magneto and common battery lines, 'of inductive means and its associated battery, manual and electromagnetic means independently controlling the inclusion of said operating invariably to include said inductive means and said battery in-the connecting circuit when the same is united with a common battery line, irrespective of'the condition of said manual means.

3. In a telephone eicchange, the combination with a connecting circuit adapted for uniting common battery andlmagneto lines, magneto supervisory signaling apparatus normally associated with said connecting circuit, a repeating coil, battery and common battery supervisory signaling apparatus, a manual key adapted to conductively separate said connecting circuit and unite the same through. said repeating coil, and electromagnets adapted to operate when connection is made to a common battery line to invariably include said repeating coil and battery in said connecting circuit'irrespective of the position of said manual key, and to substitute said common battery supervisory signaling apparatus for said magneto signaling apparatus.

4:. ,In a telephone exchange, the combination with magneto and common battery lines terminating thereat, a grounded test terminal associated with each of said common battery lines, a connecting circuit' for cal characteristics, a switch having a c ductor adapted to connect with said test terminals, a pair of relays in said conductor governed by the electrical condition of said test terminals, a repeating coil controlled by one relay, and a battery for talking purnal apparatus controlled by said other relay.

my name this 7th day of December A. D.,

EVERETT D. HALL.

lVitnesses:

M ORGAN WASI'IBURN, Jr.,

uniting said lines terminating in a threeposes and common battery supervisory sig-.

inductive means, said electromagnetic means 5. In a telephone exchange, the combina tion with test terminals of different elecEgi In witness whereof, I, hereunto subscribe 

